Photovoltaic energy storage air conditioning system and power supply control method thereof

Abstract

The invention provides a photovoltaic energy storage air conditioning system and a power supply control method thereof. The power supply control method comprises the steps that the generating capacity W of a photovoltaic module, the stored electric quantity Z of an energy storage device and the total load demand electric quantity Q of a unit are obtained; when W is smaller than Q, according to the ratio of W / Q, the energy storage device is selected to supply power to a preset high-power load and a preset low-power load in the unit, or the photovoltaic module is selected to supply power to the preset low-power load in the unit; the photovoltaic technology is applied to the air conditioning unit, clean energy solar energy is used for supplying power, dependence on traditional energy is reduced, and energy consumption is remarkably reduced; and meanwhile, electric energy generated by the photovoltaic module is reasonably utilized, efficient operation of the air conditioning unit under different working conditions is ensured, and maximum use of the electric energy is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and more specifically, relates to a photovoltaic energy storage air conditioning system and a power supply control method thereof. Background Art

[0002] Air conditioning units are widely used in electronic rooms, laboratories and other places with strict requirements on environmental conditions. However, traditional air conditioning units usually rely on traditional energy sources, which have the problems of high energy consumption and great environmental impact. Photovoltaic technology, as a clean energy, has broad application prospects, but its application in air conditioning units is still imperfect. Therefore, it is necessary to study a solution that combines photovoltaic technology with air conditioning units to achieve environmental protection and energy saving goals. Summary of the invention

[0003] In order to achieve the goal of environmental protection and energy saving, the technical solution adopted by the present invention is:

[0004] First, the present invention provides a power supply control method for a photovoltaic energy storage air conditioning system, comprising the steps of:

[0005] Obtain the power generation W of the photovoltaic module, the storage power Z of the energy storage device, and the total load demand power Q of the unit;

[0006] When W<Q, according to the ratio of W / Q, the energy storage device is selected to supply power to the predetermined high-power load and the predetermined low-power load in the unit, or the photovoltaic module is selected to supply power only to the predetermined low-power load in the unit.

[0007] Further, according to the W / Q ratio, the energy storage device is selected to supply power to a predetermined high-power load and a predetermined low-power load in the unit, or the photovoltaic module is selected to supply power only to a predetermined low-power load in the unit:

[0008] When a%<W / Q<100%, the energy storage device is selected to supply power to a predetermined high-power load and a predetermined low-power load in the unit;

[0009] When W / Q < a%, the photovoltaic module is selected to supply power only to a predetermined low-power load in the unit;

[0010] Among them, a% is the set value.

[0011] Further, when the energy storage device is selected to supply power to a predetermined high-power load in the unit, the method further includes:

[0012] The operating frequency of the predetermined high-power load is adjusted according to the stored power Z and the operating state of the unit.

[0013] Further, the predetermined high-power load includes a water pump, and the operating frequency of the predetermined high-power load is adjusted according to the stored power Z and the working state of the unit:

[0014] When the working state of the unit includes cooling treatment, if Z≥b%, the working frequency of the water pump is adjusted according to the target temperature; if Z<b%, the working frequency of the water pump is reduced, wherein b% is a set value.

[0015] Further, the predetermined high-power load includes an electric heater, and the operating frequency of the predetermined high-power load is adjusted according to the stored power Z and the working state of the unit:

[0016] When the working state of the unit includes a temperature increase process, if Z ≥ c%, the working frequency of the electric heater is adjusted according to the target temperature; if Z < c%, the working frequency of the electric heater is reduced, wherein c% is a set value.

[0017] Furthermore, the predetermined high-power load includes an electric humidifier, and the operating frequency of the predetermined high-power load is adjusted according to the stored power Z and the working state of the unit:

[0018] When the working state of the unit includes humidification processing, if Z≥d%, the working frequency of the electric humidifier is adjusted according to the target humidity, and if Z<d%, the working frequency of the electric humidifier is reduced, wherein d% is a set value.

[0019] Further, the method further comprises the steps of:

[0020] When a%<W / Q<100% and Z<e%, the energy storage device is selected to supply power only to a predetermined small power load in the unit, wherein e% is a set value.

[0021] Furthermore, the predetermined low-power load includes a damper actuator, and when a%<W / Q<100% and Z<f%, the damper actuator is closed, wherein f% is a set value.

[0022] Further, the steps include:

[0023] When W≥Q, the photovoltaic assembly is selected to supply power to a predetermined high-power load and a predetermined low-power load in the unit.

[0024] Secondly, the present invention provides a photovoltaic energy storage air-conditioning system, comprising an air-conditioning unit, a photovoltaic component for generating electrical energy and supplying power to the air-conditioning unit, and an energy storage device for storing excess electrical energy generated by the photovoltaic component and supplying power to the air-conditioning unit. The intelligent controller of the photovoltaic energy storage air-conditioning system executes the above-mentioned power supply control method.

[0025] Compared with the prior art, the photovoltaic energy storage air conditioning system and its power supply control method provided by the present invention have the beneficial effects of: by applying photovoltaic technology to the air conditioning unit, using clean energy solar energy for power supply, reducing dependence on traditional energy, and significantly reducing energy consumption. At the same time, the electric energy generated by the photovoltaic module is reasonably utilized, so that the power generation capacity of the photovoltaic module can be fully utilized, and the electric energy stored in the energy storage device can also provide support for the air conditioning unit when appropriate, thereby achieving the goals of energy saving and environmental protection under different environmental conditions, and at the same time achieving efficient matching between the electric energy generated by the photovoltaic module and the operation of the air conditioning unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 The framework diagram of the photovoltaic energy storage air conditioning system provided by the present invention;

[0028] Figure 2 A flow chart of the power supply control method provided by the present invention;

[0029] Among them, the main marks of the drawings in the figure are:

[0030] 1. Photovoltaic module; 2. Energy storage device; 3. Building; 4. Air conditioning unit; 5. First temperature and humidity sensor; 6. Second temperature and humidity sensor; 7. Third temperature and humidity sensor; 8. Electric preheater; 9. Filter; 10. Water cooling component; 11. Electric heater; 12. Rotary dehumidifier; 13. Electric humidifier; 14. Air supply fan; 15. Exhaust fan; 16. Oxygen sensor; 17. Air valve actuator; 18. Water pump; 19. Water valve actuator. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] like Figure 1 As shown, the power supply control method proposed in the present invention is suitable for a photovoltaic energy storage air conditioning system, which includes an air conditioning unit 4, a photovoltaic module 1, an energy storage device 2 and an intelligent controller.

[0033] The photovoltaic assembly 1 is used to generate electric energy and supply power to the air-conditioning unit 4 , and the energy storage device 2 is used to store the excess electric energy generated by the photovoltaic assembly 1 and supply power to the air-conditioning unit 4 .

[0034] The air conditioning unit 4 is a constant temperature and humidity unit, and the air valve actuator 17, electric preheater 8, filter 9, water cooling assembly 10, electric heater 11, rotary dehumidifier 12, electric humidifier 13 and air blower 14 are installed in the air conditioning unit 4 from left to right, wherein the water cooling assembly 10 includes a surface cooler, a water pump 18 and a water valve actuator 19. The air conditioning unit 4 is provided with a fresh air inlet and a return air inlet, and a plurality of temperature and humidity sensors and a PID controller are also installed in the air conditioning unit 4, and the PID controller is connected to the temperature and humidity sensor, and the temperature and humidity sensor includes a first temperature and humidity sensor 5 installed at the fresh air inlet, a second temperature and humidity sensor 6 installed at the return air inlet, and a third temperature and humidity sensor 7 installed at the front side of the electric humidifier 13.

[0035] The intelligent controller includes a data acquisition module, a control module and a feedback module. The intelligent controller is used to monitor the temperature and humidity data of the air in real time, and control the operating status of each load in the air-conditioning unit 4 according to preset temperature and humidity parameters.

[0036] On this basis, the power supply control method proposed in the present invention at least comprises the following steps:

[0037] Obtain the power generation W of the photovoltaic module, the storage power Z of the energy storage device, and the total load demand power Q of the unit;

[0038] When W<Q, according to the ratio of W / Q, the energy storage device is selected to supply power to the predetermined high-power load and the predetermined low-power load in the unit, or the photovoltaic module is selected to supply power only to the predetermined low-power load in the unit.

[0039] In actual applications, the power generation capacity of photovoltaic modules is affected by factors such as sunshine intensity and climatic conditions. When there is sufficient sunshine, the power generation capacity of photovoltaic modules is relatively high, which can meet the total load power demand of the air-conditioning unit (such as temperature and humidity sensors, rotary dehumidifiers, electric heaters, air valve actuators, water valve actuators and other loads) while storing excess power for use at night or on cloudy days. In periods of insufficient sunlight or peak electricity demand, the system needs to rely on energy storage device 2 (such as lithium batteries) to provide power. When the stored power is exhausted, the system will switch to mains power supply.

[0040] The advantage of this design is that by applying photovoltaic technology to air-conditioning units, clean energy solar energy is used for power supply, reducing dependence on traditional energy and significantly reducing energy consumption. At the same time, the electricity generated by photovoltaic modules is used reasonably, so that the power generation capacity of photovoltaic modules can be fully utilized, and the electricity stored in the energy storage device can also provide support for air-conditioning units when appropriate, thereby achieving the goals of energy saving and environmental protection under different environmental conditions, and achieving efficient matching between the electricity generated by photovoltaic modules and the operation of air-conditioning units.

[0041] In a further preferred embodiment, according to the W / Q ratio, the energy storage device is selected to supply power to the predetermined high-power load and the predetermined low-power load in the unit, or the photovoltaic module is selected to supply power only to the predetermined low-power load in the unit:

[0042] When a%<W / Q<100%, the energy storage device is selected to supply power to the predetermined high-power load and the predetermined low-power load in the unit;

[0043] When W / Q < a%, the photovoltaic modules are selected to supply power only to the predetermined small power load in the unit;

[0044] Wherein, a% is a set value. The specific value of a% can be flexibly set. For example, a% is 50%.

[0045] The advantage of this design is that when the power generation of the PV panels is seriously insufficient, that is, W / Q < a%, the PV panels will only supply power to the small-power loads in the air-conditioning unit, so that the electric energy generated by the PV panels will be preferentially supplied to key loads such as small-power loads to ensure the normal operation of the basic environmental control functions of the system; when the power generation of the PV panels is somewhat insufficient, that is, a% < W / Q < 100%, the energy storage device will provide additional power to maintain the normal operation of the system.

[0046] In practical applications, when the power generation of photovoltaic modules is seriously insufficient, the electricity generated by the photovoltaic modules is preferentially supplied to small-power loads, while the backup power supply is used to supply power to large-power loads, thereby better improving energy utilization efficiency.

[0047] In a further preferred embodiment, when the energy storage device is selected to supply power to a predetermined high-power load in the unit, the method further includes:

[0048] The operating frequency of the predetermined high-power load is adjusted according to the stored power Z and the working status of the unit.

[0049] The advantage of this design is that when the power generation of the photovoltaic panels is insufficient, the energy storage device is enabled and the operating frequency of the high-power load in the air-conditioning unit is dynamically adjusted to ensure that the system can continue to operate effectively.

[0050] In a further preferred embodiment, the predetermined high-power load includes a water pump, and the operating frequency of the predetermined high-power load is adjusted according to the stored power Z and the working state of the unit:

[0051] When the working state of the unit includes cooling treatment, if Z ≥ b%, the working frequency of the water pump is adjusted according to the target temperature, and if Z < b%, the working frequency of the water pump is reduced, where b% is the set value. The specific value of b% can be flexibly set, for example, b% is 40%.

[0052] In actual applications, when the air conditioning unit is in a cooling-only state, a cooling-dehumidification state, or a cooling-humidification state, the air needs to be cooled. The surface cooler, water valve actuator, and water pump in the water cooling component will work, and the water valve opening will be adjusted according to the target temperature control. Under low load conditions, the water pump operating frequency is preferentially reduced to maintain a small water valve opening; under high load conditions, the water pump increases the operating frequency while the water valve increases the opening accordingly, and the flow of cooling water is controlled to reduce the air temperature until the air temperature reaches the set range. It should be understood that the water pump in the water cooling component is a high-power load, and the water valve actuator in the water cooling component is a low-power load.

[0053] The advantage of this design is that when the air conditioning unit needs to cool the air, if the storage capacity of the energy storage device is too high, the operating frequency of the water pump will remain in normal operation to ensure that the air temperature quickly drops to the set value; if the storage capacity of the energy storage device is too low, the operating frequency of the water pump will be reduced, extending the cooling time to reduce instantaneous power consumption.

[0054] In a further preferred embodiment, the predetermined high-power load includes an electric heater, and the operating frequency of the predetermined high-power load is adjusted according to the stored power Z and the working state of the unit:

[0055] When the working state of the unit includes temperature rise processing, if Z ≥ c%, the working frequency of the electric heater is adjusted according to the target temperature, and if Z < c%, the working frequency of the electric heater is reduced, where c% is the set value. The specific value of c% can be flexibly set, for example, c% is 30%.

[0056] In actual applications, when the air conditioning unit is in a heating-only state, a heating-dehumidification state, or a heating-humidification state, the air needs to be heated. The electric heater will start, and the electric heater automatically adjusts the working frequency according to the target temperature to heat the air.

[0057] The advantage of this design is that when the air conditioning unit needs to heat the air, if the stored power of the energy storage device is not very low, the operating frequency of the heater can be automatically adjusted according to the target temperature; if the stored power of the energy storage device is very low, the operating frequency of the electric heater will be reduced and the heating time will be extended to avoid rapid consumption of stored power.

[0058] In a further preferred embodiment, the predetermined high-power load includes an electric humidifier, and the operating frequency of the predetermined high-power load is adjusted according to the stored power Z and the working state of the unit:

[0059] When the working state of the unit includes humidification, if Z ≥ d%, the working frequency of the electric humidifier is adjusted according to the target humidity, and if Z < d%, the working frequency of the electric humidifier is reduced, where d% is a set value. The specific value of d% can be flexibly set, for example, d% is 20%.

[0060] In actual application, when the air conditioning unit is in the humidification-only state, the heating humidification state, or the cooling humidification state, the air needs to be humidified. The electric humidifier will start, and the electric humidifier automatically adjusts the working frequency according to the target humidity to increase the humidity in the air.

[0061] The advantage of this design is that when the air-conditioning unit needs to humidify the air, if the stored power of the energy storage device is not very low, the operating frequency of the electric humidifier can be automatically adjusted according to the target humidity; if the stored power of the energy storage device is very low, the operating frequency of the electric humidifier will be reduced and the humidification time will be extended to avoid rapid consumption of stored power.

[0062] In a further preferred embodiment, the power supply control method further comprises the steps of:

[0063] When W / Q < a% and Z < e%, the energy storage device is selected to supply power only to the predetermined low-power load in the unit, where a%, e% are set values. The specific values ​​of a%, e% can be flexibly set, for example, a% is 50% and e% is 10%.

[0064] The advantage of this design is that when the photovoltaic panels generate insufficient electricity and store insufficient electricity, priority is given to ensuring the continuous operation of key loads such as small-power loads (such as temperature and humidity sensors, water valve actuators, air valve actuators, and rotary dehumidifiers), reducing the startup frequency of non-essential loads to ensure precise control of environmental parameters.

[0065] In a further preferred embodiment, the predetermined low-power load includes a damper actuator, and when W / Q < a% and Z < f%, the damper actuator is closed, wherein f% is a set value. The specific values ​​of a%, f% can be flexibly set, for example, a% is 50% and f% is 20%.

[0066] The advantage of this design is that when the photovoltaic panels are not generating enough electricity and the stored electricity is very low, the damper actuator can be temporarily closed to reduce unnecessary energy consumption and give priority to the operation of temperature and humidity control loads.

[0067] In a further preferred embodiment, the power supply control method further comprises the steps of:

[0068] When W≥Q, the photovoltaic modules are selected to supply power to the predetermined high-power load and the predetermined low-power load in the unit.

[0069] The advantage of this design is that when the power generation of the photovoltaic module is sufficient, that is, W ≥ Q, the photovoltaic module can meet the power demand of all loads in the air-conditioning unit. The photovoltaic module will supply power to all loads in the air-conditioning unit, and the excess electricity generated by the photovoltaic module will be stored in the energy storage device.

[0070] like Figure 1 As shown, the present invention also proposes a photovoltaic energy storage air-conditioning system, including an air-conditioning unit 4, a photovoltaic component 1, an energy storage device 2 and an intelligent controller, wherein the photovoltaic component 1 is used to generate electrical energy and supply power to the air-conditioning unit 4, the energy storage device 2 is used to store excess electrical energy generated by the photovoltaic component 1 and supply power to the air-conditioning unit 4, and the intelligent controller executes the above-mentioned power supply control method.

[0071] The advantage of this design is that by applying photovoltaic technology to air-conditioning units, clean energy solar energy is used for power supply, reducing dependence on traditional energy and significantly reducing energy consumption. At the same time, the electricity generated by photovoltaic modules is used reasonably, so that the power generation capacity of photovoltaic modules can be fully utilized, and the electricity stored in the energy storage device can also provide support for air-conditioning units when appropriate, thereby achieving the goals of energy saving and environmental protection under different environmental conditions, and achieving efficient matching between the electricity generated by photovoltaic modules and the operation of air-conditioning units.

[0072] In order to better understand the present invention, the proposed photovoltaic energy storage air conditioning system and the power supply control method thereof are described in detail below using an application example of the present invention.

[0073] like Figure 1 As shown, the photovoltaic energy storage air conditioning system proposed in the present invention mainly consists of four parts: an air conditioning unit 4, a photovoltaic module 1, an energy storage device 2 and an intelligent controller.

[0074] The photovoltaic module 1 is installed on the roof of the building 3 or the surrounding open space, and is used to convert solar energy into direct current to generate electrical energy and supply power to the air conditioning unit 4.

[0075] The energy storage device 2 is installed outside the building 3 and is connected to the photovoltaic module 1. The energy storage device 2 uses a lithium battery to store the electrical energy generated by the photovoltaic module 1 and to supply power to the air conditioning unit 4 in situations such as insufficient light.

[0076] The air conditioning unit 4 is installed inside the building 3, and an oxygen sensor 16 and an exhaust fan 15 are also installed inside the building 3. The air conditioning unit 4 adopts a constant temperature and humidity unit, and the air conditioning unit 4 is provided with a return air outlet and a fresh air outlet. The air valve actuator 17, the electric preheater 8, the filter 9, the water cooling component 10, the electric heater 11, the rotary dehumidifier 12, the electric humidifier 13 and the blower 14 are installed in the air conditioning unit 4 from left to right, wherein the water cooling component 10 includes a surface cooler, a water pump 18 and a water valve actuator 19. A plurality of temperature and humidity sensors and a PID controller are also installed in the air conditioning unit 4, and the PID controller is connected to the temperature and humidity sensors, and the temperature and humidity sensors include a first temperature and humidity sensor 5 installed at the fresh air outlet, a second temperature and humidity sensor 6 installed at the return air outlet, and a third temperature and humidity sensor 7 installed on the front side of the electric humidifier 13.

[0077] The air is detected in real time by temperature sensors at different positions to detect the air temperature AT and air humidity AS, and compared with the set temperature Ts and the set humidity Φs. Specifically, the air at the fresh air outlet is first detected in real time by the first temperature sensor and compared with the set temperature Ts to confirm whether the electric preheater 8 is turned on. Then the air coming in through the fresh air outlet is mixed with the air coming in through the return air outlet and detected by the second temperature and humidity sensor 6. If AT is higher than Ts, the water valve opening is adjusted, and the water valve actuator 19 controls the flow of cooling water to reduce the air temperature. If AT is lower than Ts, the gear and working frequency of the electric heater 11 are automatically controlled according to the temperature difference for heating; if AS is higher than Φs, the rotary dehumidifier 12 automatically controls the operation of frequency conversion according to the humidity difference to control the dehumidification amount of the air. Then the air is detected in real time by the third temperature and humidity sensor 7, and compared with the set humidity Φs to confirm whether the electric humidifier 13 is turned on. At the same time, the opening of the air valve is regulated according to the oxygen content detected by the oxygen sensor 16. This achieves energy saving and meets the normal needs of the constant temperature and humidity area inside the building 3.

[0078] The intelligent controller includes a data acquisition module, a control module and a feedback module, which monitor the temperature and humidity data of the air in real time, and control the operating status of each load in the air-conditioning unit 4 according to preset temperature and humidity parameters.

[0079] It should be understood that the working states of the air-conditioning unit 4 include a cooling-only state, a heating-only state, a humidification-only state, a cooling-only state, a cooling-dehumidification state, a cooling-humidification state, a heating-dehumidification state, and a heating-humidification state.

[0080] In actual application, the air temperature AT and the air humidity As are detected by the temperature and humidity sensors installed in the air conditioning unit 4, and the set temperature Ts and the set humidity Φs are recorded, for example, Ts=20°C-30°C, Φs=60%-80%.

[0081] Heating and dehumidifying state: The first temperature and humidity sensor 5 at the fresh air outlet first detects the air temperature AT and air humidity As. When AT<Ts, AS>Фs, heating and dehumidification are required at the same time, and the unit enters the heating and dehumidification state. Specifically, the electric preheater 8 is first turned on to increase the air temperature, and then the second temperature and humidity sensor 6 at the return air outlet detects the air temperature AT again. The electric heater 11 adjusts the gear and operating frequency according to the temperature difference to heat again, and the rotary dehumidifier 12 automatically controls the operation of frequency conversion according to the humidity difference to control the dehumidification amount of the air.

[0082] Cooling and dehumidification state: The air temperature AT and air humidity As are detected by the second temperature and humidity sensor 6 at the return air outlet. When AT>Ts, AS>Фs, cooling and dehumidification are required at the same time, and the unit enters the cooling and dehumidification state. Specifically, the water pump 18 and the water valve actuator 19 in the water cooling component 10 will start, and the water valve opening will be adjusted according to the temperature difference. Under low load conditions, the operating frequency of the water pump 18 will be reduced first to maintain a small opening of the water valve; under high load conditions, while increasing the operating frequency of the water pump 18, the water valve will increase the opening accordingly, and the flow of cooling water will be controlled to reduce the temperature of the air. The rotary dehumidifier 12 removes moisture from the air by controlling the motor speed through frequency conversion. Until the temperature and humidity of the air reach the set requirements.

[0083] Heating and humidifying state: The air temperature AT is detected by the second temperature and humidity sensor 6 at the return air outlet, and the air humidity As is detected by the third temperature and humidity sensor 7 on the front side of the electric humidifier 13. When AT<Ts, AS<Фs, heating and humidification are required at the same time, and the unit enters the heating and humidifying state. Specifically, the electric heater 11 is started to increase the air temperature. At the same time, the electric humidifier 13 automatically adjusts the gear and operating frequency according to the humidity difference to increase the humidity in the air. During this process, the system will monitor the temperature and humidity in real time through the temperature and humidity sensors, and automatically adjust the operating frequency and gear of the electric heater 11 and the electric humidifier 13 according to the preset temperature and humidity parameters to ensure that the temperature and humidity of the air meet the set requirements.

[0084] Cooling and humidification state: The air temperature AT is detected by the second temperature and humidity sensor 6 at the return air outlet, and the air humidity As is detected by the third temperature and humidity sensor 7 on the front side of the electric humidifier 13. When AT>Ts, AS<Фs, cooling and humidification are required at the same time, and the unit enters the cooling and humidification state. Specifically, the water pump 18 and the water valve actuator 19 in the water cooling component 10 will start, increase the working frequency of the water pump 18, increase the water valve opening, and increase the cooling water flow to reduce the air temperature. The electric humidifier 13 humidifies according to the humidity difference, and the system adjusts the intensity of cooling and humidification according to the feedback from the temperature and humidity sensors to ensure that the humidity of the air can be increased while cooling.

[0085] If only the air humidity As is higher than the set maximum value and the air temperature AT is within the set range, the unit only needs to perform dehumidification. At this time, the rotary dehumidifier 12 will start to remove excess moisture in the air, while the electric heater 11 remains off and the air temperature remains unchanged. On the contrary, when the air humidity As is lower than the set minimum value and the air temperature AT is within the set range, the unit only needs to perform humidification, and the electric humidifier 13 will increase the air humidity to meet the set requirements, while other temperature control loads remain off.

[0086] In some cases, the air temperature AT is higher than the set maximum value and the air humidity As is within the set range, and the unit only needs to be processed. The water pump 18 and the water valve actuator 19 in the water cooling component 10 will start, and automatically adjust the working frequency of the water pump 18 and the water valve opening according to the temperature difference to adjust the air temperature, while the humidity remains unchanged. The rotary dehumidifier 12 and the electric humidifier 13 will not work until the air temperature reaches the set requirement.

[0087] At the same time, the fresh air introduced by the air valve actuator 17 is filtered and mixed with the return air at the return air, and then the unit performs constant temperature and humidity control. The air valve actuator 17 controls the amount of fresh air introduced by controlling the opening degree of the air valve. The specific amount introduced is controlled according to the oxygen content in the constant temperature and humidity area.

[0088] It can be seen that the air-conditioning unit 4 used in the present invention improves the accuracy of temperature and humidity control and meets environmental requirements by real-time monitoring of temperature and humidity parameters and dynamically adjusting temperature and humidity control loads.

[0089] It should be understood that the load in the air-conditioning unit 4 includes high-power load and low-power load. The high-power load includes the electric heater 11, the electric humidifier 13 and the water pump 18, etc., and the low-power load includes the air valve actuator 17, the water valve actuator 19, the rotary dehumidifier 12, the temperature and humidity sensor and the oxygen sensor 16, etc.

[0090] Based on the above photovoltaic energy storage air conditioning system structure, Figure 2 As shown, the specific process of the power supply control method proposed by the present invention is as follows:

[0091] The power generation capacity of photovoltaic modules is affected by factors such as sunshine intensity and climatic conditions. When there is sufficient sunshine, the power generation capacity of photovoltaic modules is high, which can meet the power demand of all loads in the air-conditioning unit. At the same time, the energy storage device stores the excess power generated by the photovoltaic modules for use at night or on cloudy days. When there is insufficient sunlight or during peak power demand, the energy storage device provides power. When the power stored in the energy storage device is exhausted, the system will switch to the mains power supply.

[0092] When the power generation W of the photovoltaic module is sufficient, that is, W ≥ Q, the power generation W of the photovoltaic module can meet the total load demand Q of the air-conditioning unit. At this time, the photovoltaic module supplies power to the air-conditioning unit and can dynamically adjust the operating frequency of such high-power loads as electric heaters, water pumps and electric humidifiers. For example, when the air-conditioning unit is in the dehumidification and heating state, the power consumption of the electric heater is very high. Therefore, when the photovoltaic power generation is sufficient, the operating frequency of the electric heater can be appropriately increased to reduce the heating time.

[0093] When the power generation W of the photovoltaic module is insufficient, that is, 50% Q<W<Q, the stored power is enabled to supplement the power supply, and the high-power load is dynamically adjusted according to the stored power Z of the energy storage device and the working state of the air-conditioning unit. For example, when the air-conditioning unit is in the humidification-only state, the heating and humidification state, or the cooling and humidification state, if Z≥20%, the working frequency of the electric humidifier can be automatically adjusted according to the target humidity; if Z<20%, ​​the working frequency of the electric humidifier is reduced and the humidification time is extended to avoid the rapid consumption of stored power. For another example, when the air-conditioning unit is in the heating-only state, the heating and dehumidification state, or the heating and humidification state, if Z≥30%, the working frequency of the electric heater can be automatically adjusted according to the target temperature; if Z<30%, the working frequency of the electric heater is reduced and the heating time is extended to avoid the rapid consumption of stored power. For example, when the air-conditioning unit is in the cooling-only state, the cooling and dehumidification state, or the cooling and humidification state, if Z ≥ 40%, the operating frequency of the water pump maintains normal operation to ensure that the air temperature quickly drops to meet the set requirements; when Z < 40%, the operating frequency of the water pump will be reduced, extending the cooling time to reduce instantaneous power consumption.

[0094] Further optionally, when the power generation W of the photovoltaic module is insufficient and the storage capacity Z of the energy storage device is sufficient, high-power loads (electric heaters, water pumps, electric humidifiers) can be allowed to operate normally; and when the power generation W of the photovoltaic module and the storage capacity Z of the energy storage device are insufficient, priority is given to ensuring the continuous operation of key loads such as small-power loads (temperature and humidity sensors, oxygen sensors, water valve actuators, air valve actuators, rotary dehumidifiers), reducing the startup of unnecessary loads, and ensuring precise control of temperature and humidity parameters.

[0095] When the power generation W of the photovoltaic module is seriously insufficient, that is, W≤50%Q, the power generated by the photovoltaic module is first supplied to the low-power loads (temperature and humidity sensors, oxygen sensors, water valve actuators, air valve actuators, and rotary dehumidifiers). These loads always need to run under different working conditions of the unit, and their power consumption is relatively low. By giving priority to powering low-power loads, the basic temperature and humidity control functions of the system can be ensured to operate normally. At the same time, the backup power supply is turned on to supply power to high-power loads (electric heaters, water pumps, and electric humidifiers).

[0096] In addition, the damper actuator controls the amount of fresh air introduced by controlling the opening degree of the damper. It is closely related to temperature or humidity regulation, and its main function is to adjust the freshness and oxygen content of indoor air, and to open or close it under certain conditions to meet environmental requirements. Combined with the power management process, the damper actuator can be set to open or close under the following conditions: When the temperature and humidity of the indoor air are close to the set value, and the oxygen content is lower than the standard, the damper actuator opens to adjust the indoor air quality by introducing fresh air. In the case of power shortage, if the storage power Z of the energy storage device is less than 20%, the damper actuator can be temporarily closed to reduce unnecessary energy consumption and give priority to the operation of the temperature and humidity control load.

[0097] Through this dynamic optimization management of electric energy, energy utilization efficiency can be improved, the power generation capacity of photovoltaic modules can be fully utilized, and the stored electric energy of the energy storage device can also provide support for the air-conditioning unit when appropriate, thereby achieving the goals of energy saving and environmental protection under different environmental conditions.

[0098] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A power supply control method for a photovoltaic energy storage air conditioning system, characterized in that: Includes steps: Obtain the power generation W of the photovoltaic module, the storage power Z of the energy storage device, and the total load demand power Q of the unit; When W<Q, according to the ratio of W / Q, the energy storage device is selected to supply power to a predetermined high-power load and a predetermined low-power load in the unit, or the photovoltaic module is selected to supply power only to a predetermined low-power load in the unit.

2. The power supply control method according to claim 1, characterized in that: According to the W / Q ratio, the energy storage device is selected to supply power to a predetermined high-power load and a predetermined low-power load in the unit, or the photovoltaic module is selected to supply power only to a predetermined low-power load in the unit: When a%<W / Q<100%, the energy storage device is selected to supply power to a predetermined high-power load and a predetermined low-power load in the unit; When W / Q < a%, the photovoltaic module is selected to supply power only to a predetermined low-power load in the unit; Among them, a% is the set value.

3. The power supply control method according to claim 2, characterized in that: When the energy storage device is selected to supply power to a predetermined high-power load in the unit, the method further includes: The operating frequency of the predetermined high-power load is adjusted according to the stored power Z and the operating state of the unit.

4. The power supply control method according to claim 3, characterized in that: The predetermined high-power load includes a water pump, and the operating frequency of the predetermined high-power load is adjusted according to the stored power Z and the working state of the unit: When the working state of the unit includes cooling treatment, if Z≥b%, the working frequency of the water pump is adjusted according to the target temperature; if Z<b%, the working frequency of the water pump is reduced, wherein b% is a set value.

5. The power supply control method according to claim 3, characterized in that: The predetermined high-power load includes an electric heater, and the operating frequency of the predetermined high-power load is adjusted according to the stored power Z and the working state of the unit: When the working state of the unit includes a temperature rise process, if Z ≥ c%, the working frequency of the electric heater is adjusted according to the target temperature; if Z < c%, the working frequency of the electric heater is reduced, wherein c% is a set value.

6. The power supply control method according to claim 3, characterized in that: The predetermined high-power load includes an electric humidifier, and the operating frequency of the predetermined high-power load is adjusted according to the stored power Z and the working state of the unit: When the working state of the unit includes humidification processing, if Z≥d%, the working frequency of the electric humidifier is adjusted according to the target humidity, and if Z<d%, the working frequency of the electric humidifier is reduced, wherein d% is a set value.

7. The power supply control method according to claim 2, characterized in that: Also includes the steps: When a%<W / Q<100% and Z<e%, the energy storage device is selected to supply power only to a predetermined small power load in the unit, wherein e% is a set value.

8. The power supply control method according to claim 2, characterized in that: The predetermined low-power load includes a damper actuator. When a%<W / Q<100% and Z<f%, the damper actuator is closed, wherein f% is a set value.

9. The power supply control method according to claim 7, characterized in that: Includes steps: When W≥Q, the photovoltaic assembly is selected to supply power to a predetermined high-power load and a predetermined low-power load in the unit.

10. A photovoltaic energy storage air conditioning system, comprising an air conditioning unit, a photovoltaic module for generating electric energy and supplying power to the air conditioning unit, and an energy storage device for storing excess electric energy generated by the photovoltaic module and supplying power to the air conditioning unit, characterized in that: The intelligent controller of the photovoltaic energy storage air conditioning system executes the power supply control method described in any one of claims 1 to 9.

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